Weigh Fish With A Tape

Thu., April 20, 2000

From Staff Reports

Want to know how much that trout you caught weighs, but you don’t have a scale? A tape measure can be almost as accurate as a scale in getting that info.

Here’s the formula for trout:

Weight equals length times girth times girth divided by 800.

For example, if the trout is 15 inches long and its girth (the distance around its body at its widest point) is 9 inches, it weighs about 1.5 pounds (15x9x9 = 1,215 divided by 800 = 1.52).

The formula for bass is:

Length times length times girth divided by 2,700 equals weight.

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